gemcube - Build data cubes
      gemextn - List, filter and verify image extensions 
     gemhedit - Add header keyword, value and comment
      gemhead - List all headers of MEF files
      gemlist - Generate file name lists in standard Gemini format
        gemqa - Gemini data quality assessment
    gemseeing - Determine the image quality for imaging data
      imcoadd - Co-add direct images with removal of cosmic-ray-hits
     mgograph - MONGO like graphs
      rgbcomb - Make color composite of direct images  (NOT RELEASED)
gemoffsetlist - List processing for offsets (normally not used by the user)
      cnvtsec - Convert date and time to number of seconds (hidden task)
     printlog - Logfile task (hidden task)
    gimverify - Verify input/output image names (hidden task)
   gextverify - Verify extension input (hidden task)
      gsetsec - Update datasec header keyword (hidden task)
   gemvsample - Verify sky sample (hidden task)
      gemdate - Get FITS format date string (hidden task)
    getfakeUT - Generate UT string following Gemini data name convention(hidden)
  gemisnumber - Check if a string is a number, and of which type (hidden task)
      ckinput - Check input and output files, and return a list (hidden task)
        ckcal - Check lamp & S-dist files, return updated list (hidden task)

MEF handling:
     gemarith - Generic arithmetic on MEF images or spectra
      gemexpr - Gemini image expression evaluator for MEF images or spectra
   gemcombine - Combine MEF files
   gemwcscopy - Copy WCS from PHU to PHU
         wmef - Create MEF file from data, variance and DQ images

Gemini Log:
     gloginit - Initialize a Gemini log file (hidden task)
    glogprint - Write a log entry to a Gemini log file (hidden task)
    glogclose - Close a Gemini log file (hidden task)
  glogextract - Extract log entries from a Gemini log file
      glogfix - Quick fix of a Gemini log file after a crash
     glogpars - Edit the GEMLOG user preferences